Github user mcgilman commented on the issue: https://github.com/apache/nifi/pull/1697 @YolandaMDavis Code changes look good. However, one thing I noticed is that the error provided when the specified proxied user lacks sufficient permissions could be made a little more user-friendly. Currently, a stack trace reports a 403 response code. It might make sense to consume the response body when the response code is 4xx or 5xx as it should contain the reason for the failure. This may provide more details for correcting the issue.
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